Upset with himself over missing a shot, Beasley started punching himself in the head while running back on defense. He punched himself so hard that he needed treatment after the game from the Heat's trainer.

UPDATE: Here's video of Beasley punching himself after being called for a travel (via YouTube user NBillets):

Beasley, 24, signed a one-year, non-guaranteed contract with Miami in September. He did not play in Miami's preseason opener against Atlanta on Monday because of a minor leg injury, but he saw nine minutes off the bench against Detroit.

The Sun-Sentinel also reported the incident, but noted that Beasley was happy with the first game action of his second tour of duty with the Heat, who selected him with the No. 2 pick in the 2008 draft before trading him to the Timberwolves in 2010.

"It was fun," the energetic forward said. "I didn't think I was going to play. It was the first time back. I'm trying to find my way."

...

He said he was disappointed about getting a quick foul upon entering, missing a defensive rotation and failing to come up with a blocked shot on Pistons guard Will Bynum, slapping himself in the head so hard at one point that he required postgame treatment from trainer Jay Sabol.

"Overall," he said, "I give myself a B-minus, C-plus. I'm just trying to teach myself to do everything hard."

Beasley said Friday he did hit himself as he ran back down the court during the third quarter of the win. But Beasley, Heat coach Erik Spoelstra and team officials said the wound above Beasley's right eye was the result of an inadvertent blow he took from Pistons forward Jonas Jerebko as he attempted to block a shot in the third quarter, not from a self-inflicted punch.

"I watched the video, and it does look like I knocked the mess out of myself," Beasley said before Friday's preseason game against the Charlotte Bobcats at the Sprint Center. "I had everybody in the world calling me and asking, 'Why you so crazy?'"

This isn't the first time Beasley has suffered an unusual injury during a game. Back in 2012, cameras caught Beasley reacting to a gruesome finger injury while on the sideline during the fourth quarter of a game between the Timberwolves and Mavericks.